1#ifndef DMA_COHERENT_H 2#define DMA_COHERENT_H 3 4#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT 5/* 6 * These two functions are only for dma allocator. 7 * Don't use them in device drivers. 8 */ 9int dma_alloc_from_coherent(struct device *dev, ssize_t size, 10 dma_addr_t *dma_handle, void **ret); 11int dma_release_from_coherent(struct device *dev, int order, void *vaddr); 12 13/* 14 * Standard interface 15 */ 16#define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY 17extern int 18dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, 19 dma_addr_t device_addr, size_t size, int flags); 20 21extern void 22dma_release_declared_memory(struct device *dev); 23 24extern void * 25dma_mark_declared_memory_occupied(struct device *dev, 26 dma_addr_t device_addr, size_t size); 27#else 28#define dma_alloc_from_coherent(dev, size, handle, ret) (0) 29#define dma_release_from_coherent(dev, order, vaddr) (0) 30#endif 31 32#endif 33